Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
When Viridian Corrupter enters the battlefield, destroy target artifact.
6/1/2011 If there are no artifacts on the battlefield when Viridian Corrupter enters the battlefield, its enters-the-battlefield does nothing. Viridian Corrupter will simply enter the battlefield.
6/1/2011 The enters-the-battlefield ability is not optional. You must target an artifact you control if there are no other artifacts on the battlefield.